Magnolia bark extract contains mostly the biphenol neolignans Magnolol and Honokiol, which are effective in reducing anxiety and lowering cortisol levels in the blood as well as stimulating natural glucocorticoid production. Magnolia bark extract is normally used at a dosage of 250-500 mg when it is very pure. Side effects of Magnolia bark extract taken in the proper amount are minimal, and there are many additional uses such as supporting fresh breath and lack of seizures. 3 Item(s)
tl;dr: The human eye can physiologically detect up to 1000 frames per second. The average human, tasked with detecting what framerate he/she is looking at, can accurately guess up to around 150 fps. That is, they can see the difference in framerates all the way to 150 fps. Phew.
I would guess the 60 fps eye-seeing limit comes from the fact that most PC monitors (and indeed many televisions now) have a maximum refresh rate of 60hz (or 60 frames per second). If a monitor has that 60 fps limit, the monitor is physically incapable of displaying more than 60 fps.